ftglyph.h

winNT技术操作系统,国外开放的原代码和LIUX一样

  /*                                                                       */
  /*    outline :: A descriptor for the outline.                           */
  /*                                                                       */
  /* <Note>                                                                */
  /*    You can typecast a @FT_Glyph to @FT_OutlineGlyph if you have       */
  /*    `glyph->format == FT_GLYPH_FORMAT_OUTLINE'.  This lets you access  */
  /*    the outline's content easily.                                      */
  /*                                                                       */
  /*    As the outline is extracted from a glyph slot, its coordinates are */
  /*    expressed normally in 26.6 pixels, unless the flag                 */
  /*    @FT_LOAD_NO_SCALE was used in @FT_Load_Glyph() or @FT_Load_Char(). */
  /*                                                                       */
  /*    The outline's tables are always owned by the object and are        */
  /*    destroyed with it.                                                 */
  /*                                                                       */
  typedef struct  FT_OutlineGlyphRec_
  {
    FT_GlyphRec  root;
    FT_Outline   outline;

  } FT_OutlineGlyphRec;


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Get_Glyph                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A function used to extract a glyph image from a slot.              */
  /*                                                                       */
  /* <Input>                                                               */
  /*    slot   :: A handle to the source glyph slot.                       */
  /*                                                                       */
  /* <Output>                                                              */
  /*    aglyph :: A handle to the glyph object.                            */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Get_Glyph( FT_GlyphSlot  slot,
                FT_Glyph     *aglyph );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Glyph_Copy                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A function used to copy a glyph image.  Note that the created      */
  /*    @FT_Glyph object must be released with @FT_Done_Glyph.             */
  /*                                                                       */
  /* <Input>                                                               */
  /*    source :: A handle to the source glyph object.                     */
  /*                                                                       */
  /* <Output>                                                              */
  /*    target :: A handle to the target glyph object.  0 in case of       */
  /*              error.                                                   */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Glyph_Copy( FT_Glyph   source,
                 FT_Glyph  *target );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Glyph_Transform                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Transforms a glyph image if its format is scalable.                */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    glyph  :: A handle to the target glyph object.                     */
  /*                                                                       */
  /* <Input>                                                               */
  /*    matrix :: A pointer to a 2x2 matrix to apply.                      */
  /*                                                                       */
  /*    delta  :: A pointer to a 2d vector to apply.  Coordinates are      */
  /*              expressed in 1/64th of a pixel.                          */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code (if not 0, the glyph format is not scalable).  */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The 2x2 transformation matrix is also applied to the glyph's       */
  /*    advance vector.                                                    */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Glyph_Transform( FT_Glyph    glyph,
                      FT_Matrix*  matrix,
                      FT_Vector*  delta );


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    FT_Glyph_BBox_Mode                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The mode how the values of @FT_Glyph_Get_CBox are returned.        */
  /*                                                                       */
  /* <Values>                                                              */
  /*    FT_GLYPH_BBOX_UNSCALED ::                                          */
  /*      Return unscaled font units.                                      */
  /*                                                                       */
  /*    FT_GLYPH_BBOX_SUBPIXELS ::                                         */
  /*      Return unfitted 26.6 coordinates.                                */
  /*                                                                       */
  /*    FT_GLYPH_BBOX_GRIDFIT ::                                           */
  /*      Return grid-fitted 26.6 coordinates.                             */
  /*                                                                       */
  /*    FT_GLYPH_BBOX_TRUNCATE ::                                          */
  /*      Return coordinates in integer pixels.                            */
  /*                                                                       */
  /*    FT_GLYPH_BBOX_PIXELS ::                                            */
  /*      Return grid-fitted pixel coordinates.                            */
  /*                                                                       */
  typedef enum  FT_Glyph_BBox_Mode_
  {
    FT_GLYPH_BBOX_UNSCALED  = 0,
    FT_GLYPH_BBOX_SUBPIXELS = 0,
    FT_GLYPH_BBOX_GRIDFIT   = 1,
    FT_GLYPH_BBOX_TRUNCATE  = 2,
    FT_GLYPH_BBOX_PIXELS    = 3

  } FT_Glyph_BBox_Mode;


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    ft_glyph_bbox_xxx                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    These constants are deprecated.  Use the corresponding             */
  /*    @FT_Glyph_BBox_Mode values instead.                                */
  /*                                                                       */
  /* <Values>                                                              */
  /*   ft_glyph_bbox_unscaled  :: See @FT_GLYPH_BBOX_UNSCALED.             */
  /*   ft_glyph_bbox_subpixels :: See @FT_GLYPH_BBOX_SUBPIXELS.            */
  /*   ft_glyph_bbox_gridfit   :: See @FT_GLYPH_BBOX_GRIDFIT.              */
  /*   ft_glyph_bbox_truncate  :: See @FT_GLYPH_BBOX_TRUNCATE.             */
  /*   ft_glyph_bbox_pixels    :: See @FT_GLYPH_BBOX_PIXELS.               */
  /*                                                                       */
#define ft_glyph_bbox_unscaled   FT_GLYPH_BBOX_UNSCALED
#define ft_glyph_bbox_subpixels  FT_GLYPH_BBOX_SUBPIXELS
#define ft_glyph_bbox_gridfit    FT_GLYPH_BBOX_GRIDFIT
#define ft_glyph_bbox_truncate   FT_GLYPH_BBOX_TRUNCATE
#define ft_glyph_bbox_pixels     FT_GLYPH_BBOX_PIXELS


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Glyph_Get_CBox                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Return a glyph's `control box'.  The control box encloses all the  */
  /*    outline's points, including Bézier control points.  Though it      */
  /*    coincides with the exact bounding box for most glyphs, it can be   */
  /*    slightly larger in some situations (like when rotating an outline  */
  /*    which contains Bézier outside arcs).                               */
  /*                                                                       */
  /*    Computing the control box is very fast, while getting the bounding */
  /*    box can take much more time as it needs to walk over all segments  */
  /*    and arcs in the outline.  To get the latter, you can use the       */
  /*    `ftbbox' component which is dedicated to this single task.         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    glyph :: A handle to the source glyph object.                      */
  /*                                                                       */
  /*    mode  :: The mode which indicates how to interpret the returned    */
  /*             bounding box values.                                      */
  /*                                                                       */
  /* <Output>                                                              */
  /*    acbox :: The glyph coordinate bounding box.  Coordinates are       */
  /*             expressed in 1/64th of pixels if it is grid-fitted.       */
  /*                                                                       */
  /* <Note>                                                                */
  /*    Coordinates are relative to the glyph origin, using the Y-upwards  */
  /*    convention.                                                        */
  /*                                                                       */
  /*    If the glyph has been loaded with @FT_LOAD_NO_SCALE, `bbox_mode'   */
  /*    must be set to @FT_GLYPH_BBOX_UNSCALED to get unscaled font        */
  /*    units in 26.6 pixel format.  The value @FT_GLYPH_BBOX_SUBPIXELS    */
  /*    is another name for this constant.                                 */